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Novel approach to thermal degradation kinetics of gypsum: application of peak deconvolution and Model-Free isoconversional method

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Abstract

In this work, we have reinvestigated the thermal degradation kinetics of synthetic gypsum (CaSO4·2H2O) using a novel approach based on peak deconvolution followed by the application of Model-Free isoconversional method. Gypsum was prepared using wet chemical route and characterized by conventional X-ray diffraction, in situ high-temperature X-ray diffraction (HT-XRD), infrared spectroscopy (IRTF-ATR), simultaneous thermal gravimetry, and differential thermal technique (TG/DTA). The physicochemical analysis showed that gypsum thermally degrades into calcium sulfate anhydrite (γ-CaSO4; anhydrite III) via an intermediate phase formed by calcium hemihydrate (CaSO4·0.5H2O; bassanite). HT-XRD analyses revealed the difference between the bassanite and anhydrite III phases, although they have a similar structure. The thermal kinetics of gypsum indicated a complex behavior of overall process mechanism consisting of overlapping contributions, which were separated into two individual ones using a mathematical deconvolution of Fraser Suzuki function. The separate thermal processes were analyzed using Model-Free isoconversional and Malek’s methodology. The kinetic results showed that both processes may be represented by Johnson–Mehl–Avrami [JMA(n)] equation which corresponds to nucleation and growth mechanisms, with n > 1. The first process corresponding to the partial dehydration of gypsum into bassanite was carried out by a two-dimensional JMA mechanism, while the second process, attributed to the complete dehydration of gypsum, was performed according to a three-dimensional JMA. Calculations of thermodynamic parameters have shown that the dehydration process of gypsum is accompanied by endothermic effects and requires heat, in agreement with the thermal analysis data.

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Acknowledgements

The authors gratefully acknowledge the staff of the physicochemical analysis platform of the Faculty of Sciences (University Mohammed V-Rabat) for their close collaboration and discussions.

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  1. Laboratory of Nanomaterials, Nanotechnologies and Environment, Center of Materials, Faculty of Sciences, University of Mohammed V, Avenue Ibn Battouta, BP: 1014, 10000, Rabat, Morocco

    Mouatamid El Hazzat, Aicha Sifou, Said Arsalane & Adnane El Hamidi

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  1. Mouatamid El Hazzat
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El Hazzat, M., Sifou, A., Arsalane, S. et al. Novel approach to thermal degradation kinetics of gypsum: application of peak deconvolution and Model-Free isoconversional method. J Therm Anal Calorim 140, 657–671 (2020). https://doi.org/10.1007/s10973-019-08885-3

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